128030040 has 96 divisors (see below), whose sum is σ = 422042400. Its totient is φ = 33653760.

The previous prime is 128029991. The next prime is 128030051. The reversal of 128030040 is 40030821.

It is a happy number.

It is a super-2 number, since 2×128030040² = 32783382284803200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 128029995 and 128030022.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 23056 + ... + 28064.

It is an arithmetic number, because the mean of its divisors is an integer number (4396275).

Almost surely, 2^128030040 is an apocalyptic number.

128030040 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128030040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (211021200).

128030040 is an abundant number, since it is smaller than the sum of its proper divisors (294012360).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128030040 is a wasteful number, since it uses less digits than its factorization.

128030040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5097 (or 5090 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 18.

The square root of 128030040 is about 11315.0360140832. The cubic root of 128030040 is about 504.0078419037.

Adding to 128030040 its reverse (40030821), we get a palindrome (168060861).

The spelling of 128030040 in words is "one hundred twenty-eight million, thirty thousand, forty".